Is it worth to buy a new q10 today?

My fear is the next year or two years BlackBerry do not support bb10 any more...I know there are updates coming in the next months but that's not enough! Will they support us even if they say they will no longer have new bb10 devices?

That's a decision only you can make.
What you need to consider is whether or not the Q10 fulfils your communication needs regardless of BlackBerrys continued support or the lack thereof.
Posted via CB10

BlackBerry 10 is hardly getting any support anymore, but there have been no signs of any device being left behind on software updates.
But if you're still sceptical about that, then you might want to take a look at the BlackBerry Classic, a slightly better variation.